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AP: Add support for PASN processing to the SME

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Signed-off-by: Ilan Peer <ilan.peer@intel.com>
This commit is contained in:
Ilan Peer 2020-12-16 13:00:32 +02:00 committed by Jouni Malinen
parent f2f8e4f458
commit 3040c8a2da
3 changed files with 556 additions and 1 deletions
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517
src/ap/ieee802_11.c
View file

@ -25,6 +25,7 @@
#include "common/ocv.h"
#include "common/wpa_common.h"
#include "common/wpa_ctrl.h"
#include "common/ptksa_cache.h"
#include "radius/radius.h"
#include "radius/radius_client.h"
#include "p2p/p2p.h"
@ -2296,6 +2297,494 @@ ieee802_11_set_radius_info(struct hostapd_data *hapd, struct sta_info *sta,
}
#ifdef CONFIG_PASN
static struct wpabuf * pasn_get_wrapped_data(struct hostapd_data *hapd,
struct sta_info *sta)
{
switch (sta->pasn->akmp) {
case WPA_KEY_MGMT_PASN:
/* no wrapped data */
return NULL;
case WPA_KEY_MGMT_SAE:
case WPA_KEY_MGMT_FILS_SHA256:
case WPA_KEY_MGMT_FILS_SHA384:
case WPA_KEY_MGMT_FT_PSK:
case WPA_KEY_MGMT_FT_IEEE8021X:
case WPA_KEY_MGMT_FT_IEEE8021X_SHA384:
default:
wpa_printf(MSG_ERROR,
"PASN: TODO: Wrapped data for akmp=0x%x",
sta->pasn->akmp);
return NULL;
}
}
static int
pasn_derive_keys(struct hostapd_data *hapd, struct sta_info *sta,
struct rsn_pmksa_cache_entry *pmksa,
struct wpa_pasn_params_data *pasn_data,
struct wpabuf *wrapped_data,
struct wpabuf *secret)
{
static const u8 pasn_default_pmk[] = {'P', 'M', 'K', 'z'};
u8 pmk[PMK_LEN_MAX];
u8 pmk_len;
int ret;
os_memset(pmk, 0, sizeof(pmk));
pmk_len = 0;
if (!pmksa)
wpa_printf(MSG_DEBUG, "PASN: No valid PMKSA entry");
if (sta->pasn->akmp == WPA_KEY_MGMT_PASN) {
wpa_printf(MSG_DEBUG, "PASN: Using default PMK");
pmk_len = WPA_PASN_PMK_LEN;
os_memcpy(pmk, pasn_default_pmk, sizeof(pasn_default_pmk));
} else if (pmksa) {
wpa_printf(MSG_DEBUG, "PASN: Using PMKSA entry");
pmk_len = pmksa->pmk_len;
os_memcpy(pmk, pmksa->pmk, pmksa->pmk_len);
} else {
/* TODO: Derive PMK based on wrapped data */
wpa_printf(MSG_DEBUG,
"PASN: Missing implementation to derive PMK");
return -1;
}
ret = pasn_pmk_to_ptk(pmk, pmk_len, sta->addr, hapd->own_addr,
wpabuf_head(secret), wpabuf_len(secret),
&sta->pasn->ptk, sta->pasn->akmp,
sta->pasn->cipher, WPA_KDK_MAX_LEN);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive PTK");
return -1;
}
wpa_printf(MSG_DEBUG, "PASN: PTK successfully derived");
return 0;
}
static int handle_auth_pasn_resp(struct hostapd_data *hapd,
struct sta_info *sta,
struct rsn_pmksa_cache_entry *pmksa,
u16 status)
{
struct wpabuf *buf, *pubkey = NULL, *wrapped_data_buf = NULL;
u8 mic[WPA_PASN_MAX_MIC_LEN];
u8 mic_len, data_len;
u8 *ptr;
const u8 *data, *rsn_ie;
size_t rsn_ie_len;
int ret;
wpa_printf(MSG_DEBUG, "PASN: Building frame 2: status=%u", status);
buf = wpabuf_alloc(1500);
if (!buf)
goto fail;
wpa_pasn_build_auth_header(buf, hapd->own_addr, hapd->own_addr,
sta->addr, 2, status);
if (status != WLAN_STATUS_SUCCESS)
goto done;
if (wpa_pasn_add_rsne(buf, pmksa ? pmksa->pmkid : NULL,
sta->pasn->akmp, sta->pasn->cipher) < 0)
goto fail;
/* No need to derive PMK if PMKSA is given */
if (!pmksa)
wrapped_data_buf = pasn_get_wrapped_data(hapd, sta);
else
sta->pasn->wrapped_data_format = WPA_PASN_WRAPPED_DATA_NO;
/* Get public key */
pubkey = crypto_ecdh_get_pubkey(sta->pasn->ecdh, 0);
pubkey = wpabuf_zeropad(pubkey,
crypto_ecdh_prime_len(sta->pasn->ecdh));
if (!pubkey) {
wpa_printf(MSG_DEBUG, "PASN: Failed to get pubkey");
goto fail;
}
wpa_pasn_add_parameter_ie(buf, sta->pasn->group,
sta->pasn->wrapped_data_format,
pubkey, NULL, 0);
if (wpa_pasn_add_wrapped_data(buf, wrapped_data_buf) < 0)
goto fail;
wpabuf_free(wrapped_data_buf);
wrapped_data_buf = NULL;
wpabuf_free(pubkey);
pubkey = NULL;
/* Add the mic */
mic_len = pasn_mic_len(sta->pasn->akmp, sta->pasn->cipher);
wpabuf_put_u8(buf, WLAN_EID_MIC);
wpabuf_put_u8(buf, mic_len);
ptr = wpabuf_put(buf, mic_len);
os_memset(ptr, 0, mic_len);
data = wpabuf_head_u8(buf) + IEEE80211_HDRLEN;
data_len = wpabuf_len(buf) - IEEE80211_HDRLEN;
rsn_ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &rsn_ie_len);
if (!rsn_ie || !rsn_ie_len)
goto fail;
/*
* Note: wpa_auth_get_wpa_ie() might return not only the RSNE but also
* MDE, etc. Thus, do not use the returned length but instead use the
* length specified in the IE header.
*/
ret = pasn_mic(sta->pasn->ptk.kck, sta->pasn->akmp, sta->pasn->cipher,
hapd->own_addr, sta->addr, rsn_ie, rsn_ie[1] + 2,
data, data_len, mic);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Frame 3: Failed MIC calculation");
goto fail;
}
os_memcpy(ptr, mic, mic_len);
done:
wpa_printf(MSG_DEBUG,
"PASN: Building frame 2: success; resp STA=" MACSTR,
MAC2STR(sta->addr));
ret = hostapd_drv_send_mlme(hapd, wpabuf_head(buf), wpabuf_len(buf), 0,
NULL, 0, 0);
if (ret)
wpa_printf(MSG_INFO, "send_auth_reply: Send failed");
wpabuf_free(buf);
return ret;
fail:
wpabuf_free(wrapped_data_buf);
wpabuf_free(pubkey);
wpabuf_free(buf);
return -1;
}
static void handle_auth_pasn_1(struct hostapd_data *hapd, struct sta_info *sta,
const struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee802_11_elems elems;
struct wpa_ie_data rsn_data;
struct wpa_pasn_params_data pasn_params;
struct rsn_pmksa_cache_entry *pmksa;
struct wpabuf *wrapped_data = NULL, *secret = NULL;
const int *groups = hapd->conf->pasn_groups;
static const int default_groups[] = { 19, 0 };
u16 status = WLAN_STATUS_SUCCESS;
int ret;
u32 i;
if (!groups)
groups = default_groups;
if (ieee802_11_parse_elems(mgmt->u.auth.variable,
len - offsetof(struct ieee80211_mgmt,
u.auth.variable),
&elems, 0) == ParseFailed) {
wpa_printf(MSG_DEBUG,
"PASN: Failed parsing Authentication frame");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
ret = wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, elems.rsn_ie_len + 2,
&rsn_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed parsing RNSE");
status = WLAN_STATUS_INVALID_RSNIE;
goto send_resp;
}
ret = wpa_pasn_validate_rsne(&rsn_data);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed validating RSNE");
status = WLAN_STATUS_INVALID_RSNIE;
goto send_resp;
}
if (!(rsn_data.key_mgmt & hapd->conf->wpa_key_mgmt) ||
!(rsn_data.pairwise_cipher & hapd->conf->rsn_pairwise)) {
wpa_printf(MSG_DEBUG, "PASN: Mismatch in AKMP/cipher");
status = WLAN_STATUS_INVALID_RSNIE;
goto send_resp;
}
sta->pasn->akmp = rsn_data.key_mgmt;
sta->pasn->cipher = rsn_data.pairwise_cipher;
if (!elems.pasn_params || !elems.pasn_params_len) {
wpa_printf(MSG_DEBUG,
"PASN: No PASN Parameters element found");
status = WLAN_STATUS_INVALID_PARAMETERS;
goto send_resp;
}
ret = wpa_pasn_parse_parameter_ie(elems.pasn_params - 3,
elems.pasn_params_len + 3,
false, &pasn_params);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed validation of PASN Parameters IE");
status = WLAN_STATUS_INVALID_PARAMETERS;
goto send_resp;
}
for (i = 0; groups[i] > 0 && groups[i] != pasn_params.group; i++)
;
if (!pasn_params.group || groups[i] != pasn_params.group) {
wpa_printf(MSG_DEBUG, "PASN: Requested group=%hu not allowed",
pasn_params.group);
status = WLAN_STATUS_FINITE_CYCLIC_GROUP_NOT_SUPPORTED;
goto send_resp;
}
if (!pasn_params.pubkey || !pasn_params.pubkey_len) {
wpa_printf(MSG_DEBUG, "PASN: Invalid public key");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
sta->pasn->ecdh = crypto_ecdh_init(pasn_params.group);
if (!sta->pasn->ecdh) {
wpa_printf(MSG_DEBUG, "PASN: Failed to init ECDH");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
sta->pasn->group = pasn_params.group;
secret = crypto_ecdh_set_peerkey(sta->pasn->ecdh, 0,
pasn_params.pubkey,
pasn_params.pubkey_len);
if (!secret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive shared secret");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
if (pasn_params.wrapped_data_format != WPA_PASN_WRAPPED_DATA_NO) {
wrapped_data = ieee802_11_defrag(&elems,
WLAN_EID_EXTENSION,
WLAN_EID_EXT_WRAPPED_DATA);
if (!wrapped_data) {
wpa_printf(MSG_DEBUG, "PASN: Missing wrapped data");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
}
sta->pasn->wrapped_data_format = pasn_params.wrapped_data_format;
if (rsn_data.num_pmkid) {
wpa_printf(MSG_DEBUG, "PASN: Try to find PMKSA entry");
pmksa = wpa_auth_pmksa_get(hapd->wpa_auth, sta->addr,
rsn_data.pmkid);
} else {
wpa_printf(MSG_DEBUG, "PASN: No PMKID specified");
pmksa = NULL;
}
ret = pasn_derive_keys(hapd, sta, pmksa, &pasn_params,
wrapped_data, secret);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to derive keys");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto send_resp;
}
ret = pasn_auth_frame_hash(sta->pasn->akmp, sta->pasn->cipher,
((const u8 *) mgmt) + IEEE80211_HDRLEN,
len - IEEE80211_HDRLEN, sta->pasn->hash);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to compute hash");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
}
send_resp:
ret = handle_auth_pasn_resp(hapd, sta, pmksa, status);
if (ret) {
wpa_printf(MSG_DEBUG, "PASN: Failed to send response");
status = WLAN_STATUS_UNSPECIFIED_FAILURE;
} else {
wpa_printf(MSG_DEBUG,
"PASN: Success handling transaction == 1");
}
wpabuf_free(secret);
wpabuf_free(wrapped_data);
if (status != WLAN_STATUS_SUCCESS)
ap_free_sta(hapd, sta);
}
static void handle_auth_pasn_3(struct hostapd_data *hapd, struct sta_info *sta,
const struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee802_11_elems elems;
struct wpa_pasn_params_data pasn_params;
struct wpabuf *wrapped_data = NULL;
u8 mic[WPA_PASN_MAX_MIC_LEN], out_mic[WPA_PASN_MAX_MIC_LEN];
u8 mic_len;
int ret;
if (ieee802_11_parse_elems(mgmt->u.auth.variable,
len - offsetof(struct ieee80211_mgmt,
u.auth.variable),
&elems, 0) == ParseFailed) {
wpa_printf(MSG_DEBUG,
"PASN: Failed parsing Authentication frame");
goto fail;
}
/* Check that the MIC IE exists. Save it and zero out the memory. */
mic_len = pasn_mic_len(sta->pasn->akmp, sta->pasn->cipher);
if (!elems.mic || elems.mic_len != mic_len) {
wpa_printf(MSG_DEBUG,
"PASN: Invalid MIC. Expecting len=%u", mic_len);
goto fail;
} else {
os_memcpy(mic, elems.mic, mic_len);
/* TODO: Clean this up.. Should not modify received frame
* buffer. */
os_memset((u8 *) elems.mic, 0, mic_len);
}
if (!elems.pasn_params || !elems.pasn_params_len) {
wpa_printf(MSG_DEBUG,
"PASN: No PASN Parameters element found");
goto fail;
}
ret = wpa_pasn_parse_parameter_ie(elems.pasn_params - 3,
elems.pasn_params_len + 3,
false, &pasn_params);
if (ret) {
wpa_printf(MSG_DEBUG,
"PASN: Failed validation of PASN Parameters IE");
goto fail;
}
if (pasn_params.pubkey || pasn_params.pubkey_len) {
wpa_printf(MSG_DEBUG,
"PASN: Public key should not be included");
goto fail;
}
/* Verify the MIC */
ret = pasn_mic(sta->pasn->ptk.kck, sta->pasn->akmp, sta->pasn->cipher,
sta->addr, hapd->own_addr,
sta->pasn->hash, mic_len * 2,
(u8 *) &mgmt->u.auth,
len - offsetof(struct ieee80211_mgmt, u.auth),
out_mic);
wpa_hexdump_key(MSG_DEBUG, "PASN: Frame MIC", mic, mic_len);
if (ret || os_memcmp(mic, out_mic, mic_len) != 0) {
wpa_printf(MSG_DEBUG, "PASN: Failed MIC verification");
goto fail;
}
if (pasn_params.wrapped_data_format != WPA_PASN_WRAPPED_DATA_NO) {
wrapped_data = ieee802_11_defrag(&elems,
WLAN_EID_EXTENSION,
WLAN_EID_EXT_WRAPPED_DATA);
if (!wrapped_data) {
wpa_printf(MSG_DEBUG, "PASN: Missing wrapped data");
goto fail;
}
/* TODO: Handle wrapped data */
wpabuf_free(wrapped_data);
}
wpa_printf(MSG_INFO,
"PASN: Success handling transaction == 3. Store PTK");
ptksa_cache_add(hapd->ptksa, sta->addr, sta->pasn->cipher, 43200,
&sta->pasn->ptk);
fail:
ap_free_sta(hapd, sta);
}
static void handle_auth_pasn(struct hostapd_data *hapd, struct sta_info *sta,
const struct ieee80211_mgmt *mgmt, size_t len,
u16 trans_seq, u16 status)
{
if (hapd->conf->wpa != WPA_PROTO_RSN) {
wpa_printf(MSG_INFO, "PASN: RSN is not configured");
return;
}
wpa_printf(MSG_INFO, "PASN authentication: sta=" MACSTR,
MAC2STR(sta->addr));
if (trans_seq == 1) {
if (sta->pasn) {
wpa_printf(MSG_DEBUG,
"PASN: Not expecting transaction == 1");
return;
}
if (status != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG,
"PASN: Failure status in transaction == 1");
return;
}
sta->pasn = os_zalloc(sizeof(*sta->pasn));
if (!sta->pasn) {
wpa_printf(MSG_DEBUG,
"PASN: Failed to allocate PASN context");
return;
}
handle_auth_pasn_1(hapd, sta, mgmt, len);
} else if (trans_seq == 3) {
if (!sta->pasn) {
wpa_printf(MSG_DEBUG,
"PASN: Not expecting transaction == 3");
return;
}
if (status != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG,
"PASN: Failure status in transaction == 3");
ap_free_sta_pasn(hapd, sta);
return;
}
handle_auth_pasn_3(hapd, sta, mgmt, len);
} else {
wpa_printf(MSG_DEBUG,
"PASN: Invalid transaction %u - ignore", trans_seq);
}
}
#endif /* CONFIG_PASN */
static void handle_auth(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
int rssi, int from_queue)
@ -2382,6 +2871,11 @@ static void handle_auth(struct hostapd_data *hapd,
hapd->conf->fils_dh_group &&
auth_alg == WLAN_AUTH_FILS_SK_PFS) ||
#endif /* CONFIG_FILS */
#ifdef CONFIG_PASN
(hapd->conf->wpa &&
(hapd->conf->wpa_key_mgmt & WPA_KEY_MGMT_PASN) &&
auth_alg == WLAN_AUTH_PASN) ||
#endif /* CONFIG_PASN */
((hapd->conf->auth_algs & WPA_AUTH_ALG_SHARED) &&
auth_alg == WLAN_AUTH_SHARED_KEY))) {
wpa_printf(MSG_INFO, "Unsupported authentication algorithm (%d)",
@ -2391,6 +2885,9 @@ static void handle_auth(struct hostapd_data *hapd,
}
if (!(auth_transaction == 1 || auth_alg == WLAN_AUTH_SAE ||
#ifdef CONFIG_PASN
(auth_alg == WLAN_AUTH_PASN && auth_transaction == 3) ||
#endif /* CONFIG_PASN */
(auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 3))) {
wpa_printf(MSG_INFO, "Unknown authentication transaction number (%d)",
auth_transaction);
@ -2512,6 +3009,15 @@ static void handle_auth(struct hostapd_data *hapd,
return;
}
#endif /* CONFIG_MESH */
#ifdef CONFIG_PASN
if (auth_alg == WLAN_AUTH_PASN &&
(sta->flags & WLAN_STA_ASSOC)) {
wpa_printf(MSG_DEBUG,
"PASN: auth: Existing station: " MACSTR,
MAC2STR(sta->addr));
return;
}
#endif /* CONFIG_PASN */
} else {
#ifdef CONFIG_MESH
if (hapd->conf->mesh & MESH_ENABLED) {
@ -2572,11 +3078,14 @@ static void handle_auth(struct hostapd_data *hapd,
* to allow the original connection work until the attempt can complete
* (re)association, so that unprotected Authentication frame cannot be
* used to bypass PMF protection.
*
* PASN authentication does not require adding/removing station to the
* driver so skip this flow in case of PASN authentication.
*/
if (FULL_AP_CLIENT_STATE_SUPP(hapd->iface->drv_flags) &&
(!(sta->flags & WLAN_STA_MFP) || !ap_sta_is_authorized(sta)) &&
!(hapd->conf->mesh & MESH_ENABLED) &&
!(sta->added_unassoc)) {
!(sta->added_unassoc) && auth_alg != WLAN_AUTH_PASN) {
if (ap_sta_re_add(hapd, sta) < 0) {
resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
goto fail;
@ -2663,6 +3172,12 @@ static void handle_auth(struct hostapd_data *hapd,
handle_auth_fils_finish);
return;
#endif /* CONFIG_FILS */
#ifdef CONFIG_PASN
case WLAN_AUTH_PASN:
handle_auth_pasn(hapd, sta, mgmt, len, auth_transaction,
status_code);
return;
#endif /* CONFIG_PASN */
}
fail:

21
src/ap/sta_info.c
View file

@ -156,6 +156,23 @@ void ap_sta_ip6addr_del(struct hostapd_data *hapd, struct sta_info *sta)
}
#ifdef CONFIG_PASN
void ap_free_sta_pasn(struct hostapd_data *hapd, struct sta_info *sta)
{
if (sta->pasn) {
wpa_printf(MSG_DEBUG, "PASN: Free PASN context: " MACSTR,
MAC2STR(sta->addr));
if (sta->pasn->ecdh)
crypto_ecdh_deinit(sta->pasn->ecdh);
bin_clear_free(sta->pasn, sizeof(*sta->pasn));
sta->pasn = NULL;
}
}
#endif /* CONFIG_PASN */
void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
{
int set_beacon = 0;
@ -371,6 +388,10 @@ void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
eloop_cancel_timeout(ap_sta_reset_steer_flag_timer, hapd, sta);
#endif /* CONFIG_WNM_AP */
#ifdef CONFIG_PASN
ap_free_sta_pasn(hapd, sta);
#endif /* CONFIG_PASN */
os_free(sta->ifname_wds);
#ifdef CONFIG_TESTING_OPTIONS

19
src/ap/sta_info.h
View file

@ -14,6 +14,7 @@
#include "vlan.h"
#include "common/wpa_common.h"
#include "common/ieee802_11_defs.h"
#include "crypto/sha384.h"
/* STA flags */
#define WLAN_STA_AUTH BIT(0)
@ -63,6 +64,18 @@ struct pending_eapol_rx {
struct os_reltime rx_time;
};
struct pasn_data {
int akmp;
int cipher;
u16 group;
u8 trans_seq;
u8 wrapped_data_format;
u8 hash[SHA384_MAC_LEN];
struct wpa_ptk ptk;
struct crypto_ecdh *ecdh;
};
struct sta_info {
struct sta_info *next; /* next entry in sta list */
struct sta_info *hnext; /* next entry in hash table list */
@ -286,6 +299,10 @@ struct sta_info {
unsigned int airtime_weight;
struct os_reltime backlogged_until;
#endif /* CONFIG_AIRTIME_POLICY */
#ifdef CONFIG_PASN
struct pasn_data *pasn;
#endif /* CONFIG_PASN */
};
@ -363,4 +380,6 @@ int ap_sta_pending_delayed_1x_auth_fail_disconnect(struct hostapd_data *hapd,
struct sta_info *sta);
int ap_sta_re_add(struct hostapd_data *hapd, struct sta_info *sta);
void ap_free_sta_pasn(struct hostapd_data *hapd, struct sta_info *sta);
#endif /* STA_INFO_H */